You are over simplifying things, a solution by definition is/can be a mixture (it does not say there can not be a reaction involved in making the mixture), how it got to be a mixtures does not by definition preclude a reaction being involved before or after. For instance if I mix anhydrous Iron chloride with pure water, I have an iron chloride solution. There was not reaction involved there. Just mixing
If I place clean pure iron metal in DI-water, technically DI-DHMO, the DI water forms enough hydronium ion to spontaneously to dissolve some iron into the DI-water allowing H+ to difuse into the iron. Thus the iron is now in solution. Also simple electrolysis allows the water to dissolve the iron by the iron giving up an electron. It is still Fe iron.
The ability of water to form hydroxyl and hydronium ions by the H and -OH dissociation is part of how it puts iron into solution in the water. Yes it does by a reaction, but it still forms a solution of iron dissolved in water. Same for water and limestone, it dissolves calcium carbonate and magnesium carbonate.
" by Anne Marie Helmenstine, Ph.D. Updated January 31, 2018
When you dissolve table salt (sodium chloride, also known as NaCl) in water, are you producing a chemical change or a physical change? A physical change results in a change of the material's appearance, but no new chemical products result. A chemical change involves a chemical reaction, with new substances produced as a result of the change. Why Dissolving Salt Would Be a Chemical Change
When you dissolve salt in water the sodium chloride dissociates in Na+ ions and Cl- ions, which may be written as a chemical equation:
NaCl(s) ? Na+(aq) + Cl-(aq)
Therefore, dissolving salt in water is an example of a chemical change. The reactant (sodium chloride or NaCl) is different from the products (sodium cation and chlorine anion). Thus, any ionic compound that is soluble in water would experience a chemical change. In contrast, dissolving a covalent compound like sugar does not result in a chemical reaction. When sugar is dissolved, the molecules disperse throughout the water, but they don't change their chemical identity. Why Some People Consider Dissolving Salt a Physical Change
If you search online for the answer to this question, you'll see about equal numbers of responses arguing that dissolving salt is a physical change as opposed to a chemical change. The confusion arises because one common test to help distinguish chemical and physical changes is whether or not the starting material in the change may be recovered using only physical processes."
Dissolution Definitions. Dissolution is the process by which a substance forms a solution in a solvent. For the dissolution of solids, the process of dissolution can be explained as the breakdown of the crystal lattice into individual ions, atoms or molecules and their transport into the solvent. Dissolution Definitions | Sirius - The Science of Measurement www.sirius-analytical.com/science/dissolution/dissolution-definitions
HOW IT BREAKS DOWN INTO SOLUTION DOES NOT PRECLUDE A REACTION IN THAT DEFINITION.
A paint stripper, gum and varnish remover dissolves solid paint, gum and varnish by breaking up enough of the polymer bonds dissolve the smaller polymers and monomers into solution.
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